Extensive DTD validating?XML Builder. XML Editor is a clean, simple and powerful graphical XML editing and validation tool. It features full DTD validation, but doesn't require a DTD if you only want to do well-formedness validation. It gives meaningful messages that point you a conflict with the XML to the DTD, and tell you why your XML conflicted the DTD. It can tell you if your XML is badly formed in other ways. It has two viewing modes, \\Tree\\ mode and \\Source\\ mode. Source mode lets you do text editing on your XML. XML Editor will tell you exactly where in your source an error exists, and the type of error, making fixing bad XML easy.